Heating device for incubators.



No. 888,208. PATENTED MAY 19, 1908.

E. M. WALLACE.

HEATING DEVICE FOR INGUBATORS.

APPLICATION FILED FEB. 18, 1007.

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APPLICATION FILED PEB.18 1907.

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ERNEST M. WALLACE, OF ST. JOSEPH, MISSOURI.

HEATING DEVICE FOR INCUBATORS.

Specification of Letters Patent.

Patented May 19, 1908.

Application filed February 18, 1907. Serial No. 357,898.

T 0 all whom it may concern:

Be it known that I, ERNEST M. WALLACE, a citizen of the United States, residing at St. Joseph, in the county of Buchanan, State of Missouri, have invented certain new and useful Improvements in Heating Devices for Incubators and I do hereby declare the following to be a full, clear, and exact descrip tion of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to heating devices for incubators and more particularly to that class in which hot water is the heating agent.

In carrying out my invention I employ an annular water receptacle within which is rigidly confined a pair of superposed frusto-conical tubular members, the lower member of which has its upper end projecting into the lower or major end of the upper member and is fixedly held in this relation by means of a perforated annular disk and the upper end of the upper frusto-conical member is braced in concentric relation with respect to the inner periphery of the annular water receptacle by means of a similar disk. The arrangement of these frustoconical tubular members has been found by me to afford a very satisfactory draft device for a lamp which is placed beneath the lower member of the pair by reason that while there is a suflicient draft maintained, the heated currents of air are retained in the device a sufficient length of time to thoroughly heat the water.

In the accompanying drawings, Figure 1 is a side elevation of the device removed from an incubator, Fig. 2 is a detail vertical sectional view therethrough, Fig. 3 is a top plan View in detail, and, Fig 4 is a detail horizontal sectional view taken in a plane directly above the upper end of the lower frusto-conical tubular member.

Referring more specifically to the drawings the heating device is shown as comprising an annular water receptacle or container 5 which is closed at its upper and lower ends and is preferably of greater height than (liameter. Leading from one side of the receptacle and adjacent the upper end thereof is a horizontally disposed pipe 6 which, at a point removed from the receptacle is bent to extend at right angles but at an incline as at 7 and again at right angles and in an inclined plane as at S. The pipe is then turned to extend at right angles and in the direction of the portion 6 as indicated at 9 and at the end of this portion 9 the pipe communicates with the receptacle 5 at a point directly below the point of communication of the portion 6 with the receptacle and adjacent the lower end of the receptacle as at 10.

Secured at its lower or major end to the inner periphery of the annular water receptaclc 5 am at the extreme lower edge thereof is a frusto-conical tubular member 11 which extends upwardly to about the middle of the receptacle and this member is open both at its upper and lower ends. A second frustoconical tubular member 12 is disposed above the member 11 and concentrically with re spect to the same and is supported rigidly in this relation to the member 11 by means of an annular perforated disk 13 which is secured at its inner periphery to the outer side of the upper end of the member and at its outer periphery to the inner side of the lower end of the member 12 and a similar disk 14 is sccured at its inner periphery to the outer side of the member 12 adjacent the upper end thereof and at its outer periphery to the upper edge of the inner periphery of the receptacle 5, this last named disk serving to brace the upper portion of the member 12 in concentric relation with respect to the receptacle 5. The member 12 however as clearly shown in the detail vertical sectional View is of less diameter at its lower end than the corresponding end oftho member 11 and consequently there is a space between the inner periphery of the receptacle 5 and the member 12 at all points. The usual damper plate is indicated by the numeral 15 and is shown as being extended directly over the upper end of the member 12.

Now from the foregoing description of my invention it will be readily understood that when a lamp or other heating device is placed beneath the member 11 the upper end of its chimney or llue projecting a short distance into the member, the initial currents of hot air that are generated will pass up through the member 11 and pass over the upper end of the same, through the perforations in the disk 13, and thence beneath the lower end of the member 12 and. up through the openings in the disk 14 thus effectually heating the water contained in the receptacle 5 and causing the same to circulate through the portions of the pipe 6 in the numerical order in which they have been previously described. It will furthermore be understood that the passage of heated air currents through the device in the manner described will vary as the damper 15 is raised or lowered and that consequently an even temperature of the water will be maintained. It will further be understood that the passage of heated air currents through the device will be retarded by the perforated disks l3 and 14, and that the air is first discharged from the member 11 into the member 12, then passes slowly into the disk 13, into the interspace between the members 11 and 12, and the inner wall of the water container, and finally slowly out through the openings in the disk 14. It will also be understood that by providing the perforated annulus 13 the passage of hot air currents through the devicewill be properly retarded. j

l/Vhat is claimed is- 1. A device of the class described, comprising an annular water container having outlet and return pipes communicating therewith, a frusto-conical tubular member secured at'its lower edge to the lower end of the inner wall of the container and project ing upwardly into the space inclosed by said inner wall, a second frusto-conical tubular member disposed above the first-mentioned member in co-aXial relation therewith and with its larger end downward and surrounding'and spaced from the upper end of said lower member, an annular perforated disk resting upon said lower member and sup-, porting the upper member in said relation and partially closing the space between the upper end of the lower member and the lower end of the upper member, and a similar disk extending from the upper end of the inner wall of the container to the upper portion of the upper member, and a damper arranged and adapted to be operated to control the passage through the upper member.

2. A device of the class described comprising an annular water container having outlet and return pipes communicating therewith, a frusto-conical tubular member se cured at its lower edge to the lower edge of the inner wall of the container and projecting upwardly from the space inclosed by the said inner wall, a second frusto-conical tubular member disposed above the first mentioned member in co-axial relation there- In testimony whereof, I aflix my signature, 8

in presence of two witnesses.

ERNEST M. WVALLACE.

l/Vitnesses:

A. W. MOKINLEY, D. R. FORGAN. 

